Postumus the Younger

{{Short description|Possible 3rd century Roman imperial usurper}}

File:Postumus Iunior.jpg's Promptuarii Iconum Insigniorum]]

In the Historia Augusta, Postumus the Younger ({{Langx|la|Postumus Iūnior}}) figures as one of the so-called Thirty Tyrants who usurped power against the Roman Emperor Gallienus.

According to the pseudo-historical list of 'Thirty Tyrants', the Emperor of the Gallic Empire Postumus had a son, also called Postumus, whom he nominated to be first caesar, and later even augustus and co-ruler. Postumus the Younger would have been killed together with his father in 268, during the rebellion of Laelianus (called Lollianus in the Historia).Historia Augusta (authorship disputed), [https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Historia_Augusta/Tyranni_XXX*.html Tyranni Triginta 4]

The historian J. F. Drinkwater dismisses the Historia Augusta's reference to Postumus the Younger as a "fiction".J. F. Drinkwater (1987). The Gallic Empire: Separatism and continuity in the north-western provinces of the Roman Empire, A.D. 260–274, Franz Steiner Verlag Wiesbaden GMBH, Stuttgart, {{ISBN|3-515-04806-5}}, p. 65. There are no references to any son of Postumus on coins or inscriptions from the period.

The author(s) of the Historia asserts that Postumus the Younger was a skilled rhetor, and that his Controversiae were included among Quintilian's Declamationes.